An ICT distribution designer is estimating the installation of five units of 1.5 m (5 ft) tong channel basket trays connected together in the ceiling. The total length of the pathway needed is 7.5 m…

Question

Options

• A2
• B5
• C7
• D10
• E20

• A
  2% (1)
• B
  73% (38)
• C
  4% (2)
• D
  15% (8)
• E
  6% (3)

Explanation

Option B (5 supports) is correct because the standard rule for cable tray installation requires one support per tray unit. With five 1.5 m tray sections, you need exactly five supports - one for each unit, regardless of the total run length.

Why the distractors are wrong:

• A (2) is tempting if you think only of the two endpoints of the run, but that ignores the intermediate tray sections that also require support.
• C (7) might arise if someone miscalculates by adding the number of connection joints (4) to the number of trays (5) minus a correction - there's no standard formula that produces 7 here.
• D (10) comes from incorrectly applying 2 supports per tray (5 × 2 = 10), which would be excessive and non-standard.
• E (20) likely results from confusing the unit length in feet (5 ft) with the count, multiplying 5 trays × 4 supports, or some other miscalculation unrelated to the standard.

Memory tip: Think "1 tray = 1 support." Just count the number of tray sections in the run - that number is always your answer when trays are connected end-to-end with no special spanning exceptions.

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